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RE: Dark stars as a cosmic window on a mirror world
That was a wonderful answer! I do believe I understand:
electromagnetisms allow the two photons to mix when they propagate.
In theoretical particle physics, you follow the laws, and the laws allow this...predict this. However,
As a result, the mixing between the two photons is constrained to be of at most one part in a billion. It is thus damned small, so that any related phenomenon will be super rare, and thus hard to detect experimentally.
I had to read it a couple of times...not because the answer was dense but because, I had to :) But I believe I've got it. A very tiny, but satisfying moment of enlightenment :))
Thank you, @lemouth!
Concerning the mixing, it cannot be zero. A zero means simply there must be a symmetry behind it. But data is the queen after all. So if data tells it's small, it's small.
One further question (without any real answer) which this could lead to is the following: How come it is so small? This is indeed very unnatural: we like parameters of order of 0.1-1.
The quick answer is that there must be some mechanism behind the entire setup that makes the mixing tiny. And this is where it starts to be tricky (and funny too)... Designing such a mechanism.